MSP430 real-time rtimer support using timerb1

2007-04-03 19:03:09 +00:00 · 2007-04-03 19:03:09 +00:00 · 00645113e5
parent 1e950af492
commit 00645113e5
2 changed files with 145 additions and 0 deletions
--- a/cpu/msp430/rtimer-arch.c
+++ b/cpu/msp430/rtimer-arch.c
@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: rtimer-arch.c,v 1.1 2007/04/03 19:03:09 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         Native (non-specific) code for the Contiki real-time module rt
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#include <io.h>
+#include <signal.h>
+
+#include "sys/rtimer.h"
+
+#define DEBUG 0
+#if DEBUG
+#include <stdio.h>
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
+
+/*---------------------------------------------------------------------------*/
+interrupt(TIMERB1_VECTOR) timerb1 (void) {
+  if(TBIV == 2) {
+    rtimer_run_next();
+  }
+}
+/*---------------------------------------------------------------------------*/
+void
+rtimer_arch_init(void)
+{
+  dint();
+
+  /* Select SMCLK (2.4576MHz), clear TAR */
+  /* TACTL = TASSEL1 | TACLR | ID_3; */
+  /* Select ACLK 32768Hz clock, divide by 8 */
+  TBCTL = TBSSEL0 | TBCLR | ID_3;
+
+  /* Initialize ccr1 to create the X ms interval. */
+  /* CCR1 interrupt enabled, interrupt occurs when timer equals CCR1. */
+  TBCCTL1 = CCIE;
+
+  /* Interrupt after X ms. */
+  /*  TBCCR1 = INTERVAL;*/
+
+  /* Start Timer_A in continuous mode. */
+  TBCTL |= MC1;
+
+  BCSCTL1 &= ~(DIVA1 + DIVA0);   /* remove /8 divisor from ACLK again    */
+
+  /* Enable interrupts. */
+  eint();
+}
+/*---------------------------------------------------------------------------*/
+void
+rtimer_arch_schedule(rtimer_clock_t t)
+{
+  PRINTF("rtimer_arch_schedule time %u\n", t);
+  TBCCR1 = t;
+}
+/*---------------------------------------------------------------------------*/
+rtimer_clock_t
+rtimer_arch_now(void)
+{
+  return TBCCR1;
+}
+/*---------------------------------------------------------------------------*/
--- a/cpu/msp430/rtimer-arch.h
+++ b/cpu/msp430/rtimer-arch.h
@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: rtimer-arch.h,v 1.1 2007/04/03 19:03:10 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         A brief description of what this file is.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __RTIMER_ARCH_H__
+#define __RTIMER_ARCH_H__
+
+#define RTIMER_ARCH_SECOND 4096
+
+#endif /* __RTIMER_ARCH_H__ */